High-temperature Alloy Applications

Top Choice for Nitric Acid Catalyst Grids

For demanding long-term applications as catalyst grid support material in nitric acid production, HAYNES® 230® alloy represents a significant advance over the materials, such as HASTELLOY® X alloy. The increase in resistance to in-service creep distortion displayed by 230® alloy translates directly into as much as 5 times longer service interval between straightening operations. The advantage is greater the higher the operating temperature. 230® alloy is also shows less loss of ductility with long-term thermal exposure. That means when straightening does become necessary, 230® alloy will still have the required ductility.

230® alloy is currently in service in over 30 nitric acid catalyst grid support applications around the world, some for as long as five years or more. Its excellent nitriding-resistance, oxidation-resistance, and resistance to combustion environments, make it suitable for a wide variety of additional industrial applications.

Nitric acid catalyst grid support made from HAYNES®230® alloy and plate bar. Excellent creep strength at 1700°F (925°C) makes the alloy highly suitable for this application.

Product Description

230® alloy is a top-of-the-line high-performance, industrial heat-resistant alloy for applications demanding high strength as well as resistance to environment. It is a substantial upgrade in performance capabilities from common iron-nickel-chromium and nickel-chromium alloys, and displays the best combination of strength, stability, environment-resistance and fabricability of any commercial nickel-base alloy.

230® alloy can be utilized at temperatures as high as 2100ºF (1150ºC) for continuous service. Its resistance to oxidation, combustion environments and nitriding commends it highly for applications such as nitric acid catalyst grids, high-temperature bellows, industrial furnace fixtures and hardware, strand annealing tubes, thermo-couple protection tubes, and many more.

230® alloy is covered by ASME Section VIII, Division I, and ASME Section I, Code Case 2063-3, both up to 1650ºF (900ºC). 230 alloy is also covered by a number of ASTM and AMS specifications.

Properties Data

The data and information in this publication are based upon work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature, and are believed to be reliable. However, Haynes International, Inc. does not make any warranty or assume any legal liability or responsibility for its accuracy, completeness, or usefulness. Haynes also makes no warranty of results to be obtained for any particular use of the information here in contained. Material safety data sheets are available from Haynes International, Inc.